Improved lifting-jack



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L.' J. BLADES, or HARRINGTONAND JOHN MAHoNEY, or WILMtueren,

A DELAWARE. A

Leners Patent No. 100,846, ma Marti 175, 1870.

The Schedule referred to in these Letters Patent and making part of the same.

' To all whom 'it may concern.-

Be it known that we, L. J. BLADES, of Harrington, in the county of Kent, .and State of Delaware, and JOHN MAHONEY, ofthe city of Wilmington, and State of Delaware, have invented a new and improved Track- J ack or Lifting-Machine, calculated for raising railroad `tracks and other heavy bodies; and we do hereby de! clave thatthe following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings making a part of this specification, in which- Figure 1 is a side view.

Figure 2, a front View.

Figure 3, a section through the center.

To enable others to construct and use our machine we will proceed to describe its construction.

We compose our jack or lifter of iron and steel, the

`body abeing of iron, and so constructed as to hold the spring catch" b withA thewheel c and circular eccentric-ended lever d, in the' center .of its upper end, as shown in Iig. 3.

To this body. we attach the sliding notched lifter e, kept in' place by the bandh at the top, and the catch chock y. f

The spring cat cl1`b, shown at iig. 3, sets in the bod-y at fi.

The wheel c we compose 'of steel, and face-the end of the lever with steel.

:When a heavy body like a railway track is to be I' lifted, we set the jack so as to insert the foot-piece or *shoe of the lifter, j, under it, Then, by lifting the lever d, We bring the pins in its end down far enough to enter the notch below it, and bearing down the handle, the end working upon the wheel or roller c, readily forces the slide with its burdenup a notch, and the pins of the slide catch are forced into the notch below, and hold the slide firmly in place until. the process is `repeated, and so on until the thing to be moved is raised to the required height. The peculiar construction of the end of the lever, in connection with the stationary wheel or pulley, acton the principle of' friction-rollers, and very readily overcome the weight in lifting.

We do not claim the notched sliding lifter e, as it has in one shape oranother been already used in jacks; but v i What we claim as our invention, and desire to secure byLetters Patent, isg i 1.A The eccentric lever and reciprocating wheel, when set in the body or immovable portion of a jack or lifting-machine, constructed and arranged substantially as herein shown and set forth.

2. The wheel c and lever d, in combination with the notched lifting slide e and thespring catch b, constructed and arranged substantially as hereinbefore described, and for the purposes specified.

. l L. J. BLADES.

l JNO. MAHONEY.

Witnesses:

l W. M. SILVER, Jr.,

EDWARDJ. DOUGHERTY. 

